Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

[linux.git] / arch / powerpc / kernel / process.c

diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index d645da302bf22f46c046bcb3912bbdd51186c416..baae104b16c7ba9f7cdf4a305ab5227ebf002467 100644 (file)
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -864,6 +864,25 @@ static void tm_reclaim_thread(struct thread_struct *thr,
        if (!MSR_TM_SUSPENDED(mfmsr()))
                return;
 
+       /*
+        * If we are in a transaction and FP is off then we can't have
+        * used FP inside that transaction. Hence the checkpointed
+        * state is the same as the live state. We need to copy the
+        * live state to the checkpointed state so that when the
+        * transaction is restored, the checkpointed state is correct
+        * and the aborted transaction sees the correct state. We use
+        * ckpt_regs.msr here as that's what tm_reclaim will use to
+        * determine if it's going to write the checkpointed state or
+        * not. So either this will write the checkpointed registers,
+        * or reclaim will. Similarly for VMX.
+        */
+       if ((thr->ckpt_regs.msr & MSR_FP) == 0)
+               memcpy(&thr->ckfp_state, &thr->fp_state,
+                      sizeof(struct thread_fp_state));
+       if ((thr->ckpt_regs.msr & MSR_VEC) == 0)
+               memcpy(&thr->ckvr_state, &thr->vr_state,
+                      sizeof(struct thread_vr_state));
+
        giveup_all(container_of(thr, struct task_struct, thread));
 
        tm_reclaim(thr, thr->ckpt_regs.msr, cause);